A man goes to visit his 85-year-old grandfather in the hospital.

“How are you, Grandpa?” he asks.

“Feeling fine,” says the old man.

“What’s the food like?”

“Wonderful menus.  These young nurses really take good care of us.”

“What about sleeping?  Do you sleep OK?”

“Nine hours solid every night.  At 10 o’clock they bring me a cup of hot chocolate and a Viagra tablet. And I go out like a light”

The grandson is puzzled and a little alarmed by this, so he rushes off to question the Sister in charge.

“I’m told you’re giving my 85-year-old grandfather Viagra on a daily basis,” he says.  “Surely that can’t be true?”

“Oh, yes,” replies the Sister.  “Every night at 10 o’clock we give him a cup of hot chocolate and a Viagra tablet.  It works wonderfully well.  The hot chocolate makes him sleep and the Viagra stops him from rolling out of bed.”